Support for sewing-machine motors



H. MAIM'IN.

SUPPORT FOR SEWING MACHINE MOTORS. APPLICATION men DEC.8, m9.

1,377,017, Patented May3, 1921.

6 rtomup UNITED STATES EYMAN M'AIMIN, or New YORK/N. Y

surron'r r011 SEWING-MACHINE MOTORS.

Speei fieation of Letters Patent.

Patented May 3, 1921.

Application ma; December a, 1919. Serial No. 343,215.

clear, and exact description of the .invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

This invention relates tobrackets for supporting upon the frames of sewing machines the small electrlc motors now provided for driving the machines.

T In my copending application, Serial l\o.

337,643, filed November 13, 1919,I have.

shown a bracket particularly adapted for this purpose, which consists primarily of a supporting member adapted to be brought into engagement with the horizontal arm of the frame of a sewing machine and held in place by-the weight of the motor which is mounted upon the free end of the member. In order more securely to hold the supporting member in place, there is associated with the member a locking member also adapted to engage the horizontal arm of the machine frame and arranged to be connected to the supporting member in such a manneras to prevent any displacement of the latter, due to vibration of the motor, or by an upward thrust tending to lift the motor and thus release the locking member. The motormay be attached to the supporting member in such relation to the driving wheel of the sewing machine that a friction pulley on the shaft of the motor will be held in engagement with the driving wheel by the weight of the motor, or a belt may be used for connecting the motor to the driving wheel, the tension of the belt being maintained by the weight of the motor or the elasticity of the supporting member.

By mounting the motor upon a member which is constructed to be secured to the frame of the machine, I avoid the use of pedestals or other supporting members mounted upon the table of the machine, and which are an obstruction and interfere with the use of the table for holding the work. The bracket is on one side of the frame where it is out of the way of the thread, and may be quickly applied to any form of sewing machine without requiring any preparations,such as the drilling of holes in rangements of this character is avoided,'and

the construction of the device iscorrespondlngly cheapened and simplified.

In the device of my prior application, one end of the locking member is pivotally attached to the supporting member near the end of the latter which engages the machine frame, and the other end of the lock- 1ng member is arranged to be clamped to thesupporting member at an intermediate point. Sewing machines of the usual construction are 'provided with spindles project- 111g from the top of the frame and adapted to hold the spools of thread which are to be used in the machines. In accordance with the present invention, I make use of this spool spindle for retaining in place upon the top of the machine frame an auxiliary supporting member which is associated with the main supporting member at an intermediate point and takes the place of the locking member of my prior application. This auxiliary member may be formed integrally with the supporting member, or it may consist of a separate member adapted to be con nected to the supporting member in any convenient manner, as by being provided .with a hook in which the supporting member may be seated.

The particular nature of the invention, as well as other objects and advantages thereof, will appear more clearly from a description of certainpreferred embodiments as shown in the accompanying drawings, in whicli Figure 1 is a side elevation of the frame of a sewing machine with one form of device in place thereon; n

Fig. 2 is an end view of the frame and device;

Fig. 3 is a detailed view of the auxiliary supporting member of the device shown in Fig. 1;

Fig. 4 is a view similar to Fig. 1, but showing a different form of device; and

Fig. 5 is a similar view showing another form of device.

In the drawings, 10 represents the base of a sewing machine frame, comprising a yertical standard 11 and a horizontal arm 12, upon the top of which is mounted a spindle 13 to hold a spool of thread to be used in the machine. At the outer end of the horizontal arm 12 is ahead 14.. within which the mechanism for reciprocating the needle is mounted, this mechanism being driven by a wheel 15 adapted to cooperate with a friction pulley 16 on the shaft of a small driving motor 17. The motor casing is provided with lugs 18 by which it may be attached to lugs 19 of asupporting member 20 by means of a pin 21, or in any other suitable manner. The inner end of'the supporting member is provided with upper and lower extensions 22 and 23, respectively, adapted to fit over the top and bottom of the horizontal arm 12 of the frame. The supporting member 20 is bent outwardly asindicated in Fig. 2, to clear the machine wheel 15 and bring the pivotal connection for the motor in proper relation to this wheel.

. In a supporting member constructed as above described, the weight of the motor upon the end of the member will produce a turning moment which will be opposed by the engagement of the upper and lower extensions with the frame, so that the member may be held in place upon the frame without'any other means. In practice, however, I prefer to provide an auxiliary supporting member 24 to cooperate with the main sup-.

hook within which the main supporting member 20 may be received as shown most clearly in Fig. 1.

When it is desired to apply to the frame of a sewing machine the form of device described above, the auxiliary member 24 will be placed over the spool spindle 13 and the main supporting member 20 will be placed upon the horizontal arm of the frame by tilting it upwardly so that the extensions 22 and 23 may be passed over the top and bottom of the frame, after which the member will be swung downwardly into the position indicated in Fig. 1 until the extensions 22 and 23 engage the frame. The auxiliary supporting member will be so constructed and mounted upon the frame that when the main supporting member 20 is in position, it will enter the hook of the auxiliary supporting member and rest upon the bottom thereof. Whenthe device is properly positioned upon the frame, the motor may be swung about its pivot 21 to bring the friction pulley 16.

into engagement with the driving wheel 15 of the machine.

, In the embodiment of the invention described above, it is intended that the bracket shall be so arranged that when it is in place upon the frame of the machine, the motor .will be held by gravity with its driving preferably be arranged so that the motor is drawn toward thepulley of the machineto cause the weight of the motor to maintain the required tension in the belt. As afurther modification of the apparatus, the motor may be rigidly attached to the supporting member 20 and the driving belt may be of such length that the motor and the free end of the supporting member will be drawn slightly toward the pulley of the machine so that the resiliency of the supporting member .will maintain sufficient tension in the driving belt.

The form of device shown in Fig. 1 may be modified by eliminating the upper extension 22 and employing the auxiliary member to resist the turning moment, due to the weight of the motor. In Fig. 4 there is shown such a modification of the invention in which the supporting member 20 isrovided with a single extension 23 adapted to engage the bottom of the horizontal arm of the machine frame The auxiliary supporting member 24' is of substantially the same construction as that described above, but its book portion receive a pin or bolt 2 which may pass through any one of a number of apertures28 in the supporting member 20'.

In the device described above the weight of the motor acting upon the end of the supporting member 20 tends to produce a turn} llilig moment which is opposed by the jpint e ect of the extension 23 and the auxiliary supporting member 2 1, so that the latter performs in part the function of the upper extension 22 of the embodiment shown in Fig. 1, and also preventssidewise displacement of the bracket, due to shocks or vibrations of the motor.

The modification shown in Fig. 4 may be further simplified by formingt e main and auxiliary supporting members of the bracket out of one piece-as shown in Fig. 5. In this case the supporting member 20" is provided at its inner end with an extension 23" adapted to engage the bottom of the horizontal part of the machine frame. At an interme- -may be provided with a ertures adapted to diate part of the member there is an up- 13 wardly extending portion 24! which is' bent over'and provided with apertures through which the spool spindle may be passed. This modification of the device lacks the adjustability of the structure of Fig. 4, but may be advantageously employed in those cases While certain preferred embodiments of.

the invention have been shown and described, it will be understood that the invention may be embodied in other forms, and that various other changes in the details of construction may be made without departing from'the principle of the invention as defined in the appended claims.

I claim:

1. The combination with the frame and wheel of a'machine to be driven, of a motor, a bracket adapted to be detachably secured to a horizontal part of the machine frame and provided at one end with an extension to engage the bottom of this 'part of the frame, and at an intermediate point with an adjustable member adapted to engage the top of the horizontal part of the frame, means for attaching the motor to the other end of the bracket, whereby its weight will hold the bracket in place on the frame, and means for driving the machine wheel from the motor.

2. The combination with the frame and wheel of a machine to be driven, of a motor, a supporting member adapted to be detachably secured to a horizontal part of the machine frame and provided at one end with upper and lower extensions to engage the top and bottom of this part of the frame,

means for attaching the motorto the other end of the member wherebyits weight will hold the member in place on the frame, auxiliary supporting means for the member as-,

sociated with the latter at an intermediate point and provided with an extension 7 adapted to rest upon the top of the horizontal part of the frame, and means for driving the'machine wheel from .the motor.

3. In a sewing machine havin a driving wheel and a frame provided w1th a spool spindle projecting from the top thereof, the combination of a motor, a bracket adapted to be detachably secured to a horizo ntal part of the machine frameand provided at one her adapted to be detachably secured to a horizontal part of the machine frame and provided at one end with upper andlower extensions to engage the top andbottom of this part of the frame, means for attaching wheel and a frame provided with. a spool spindle projecting from the top thereof, the combination of a motor, a supportingmemthe motor to the other end of the member whereby its weight will hold the member in place on the frame, auxiliary supporting means for the member connected to the latter at an intermediate point and provided with an extension adapted to fit over the spool spindle and rest upon the top ofthe horizontal part of the frame and means for .driving the machine wheel f 5. A bracket for supporting a motor upon the frame of a sewmgmachine provided with a spool spindle projecting from the top thereof, comprising a member upon the outer end of which the motor is mounted and provided with an extension adapted to engage the under siderof the frame, and means associated with the member and adapted to engage the top of the frame and rom the motor.

be held in place by the spool spindle whereby the turning moment due to the wei ht of the motor is opposed and the mem er is held upon the frame.

6. In a sewing machine having a drivin wheel and a frame provided Wltll a spoo spindle projecting from thetop thereof, the

combination of a motor, a'bracket adaptedto be detachably secured to the machine frame and comprising apair of connected members formed at their ends to engage the loo frame, one of said members being provided with a plurality of apertures adapted to receive the spool spindle to hold the mem-' ber in place on the frame, means for mounting the motor on the bracket, and means.

for driving the wheelof the machine from the motor.

In testimony whereof I aflix my signature. 

